Image forming device and control method thereof

Abstract

An image forming device includes: an image bearing member to rotate; a charging member to charge a surface of the image bearing member; a developing member located in a rotation direction of the image bearing member and in downstream of the charging member along the rotation direction, and configured to supply developer to the image bearing member; a driving unit to drive the image bearing member, the charging member and the developing member to rotate; and a control unit, configured to adjust a control timing for applying a voltage to the charging member and the developing member, and control an operating state of the driving unit according to a current state of the image forming device, to eliminate charges in an area on the image bearing member between a position of the charging member and a position of the developing member.

What is claimed is: 
     
         1 . An image forming device, comprising:
 an image bearing member, configured to rotate;   a charging member, configured to charge a surface of the image bearing member by contacting the image bearing member;   a developing member located in a rotation direction of the image bearing member and in downstream of the charging member along the rotation direction, wherein the developing member is configured to supply developer to the image bearing member;   a driving unit, configured to drive the image bearing member, the charging member and the developing member to rotate; and   a control unit, configured to adjust a control timing for applying a voltage to the charging member and the developing member, and control an operating state of the driving unit according to a current state of the image forming device, to eliminate charges in an area on the image bearing member between a position corresponding to the charging member and a position corresponding to the developing member.   
     
     
         2 . The device according to  claim 1 , further including:
 a charging voltage applying unit, configured to apply a charging voltage to the charging member;   a developing voltage applying unit, configured to apply a developing voltage to the developing member; and   a voltage supply unit, configured to supply voltage to the charging voltage applying unit and the developing voltage applying unit,   wherein:   the control unit is further configured to control the timing of the voltage supply unit supplying voltage to the charging voltage applying unit and the developing voltage applying unit, and to control the operating state of the driving unit, according to the current state of the image forming device.   
     
     
         3 . The device according to  claim 2 , wherein:
 when being configured to control the timing of the voltage supply unit supplying the voltage to the charging voltage applying unit and the developing voltage applying unit and control the operating state of the driving unit according to the current state of the image forming device, the control unit is configured to: when the image forming device is in a paper jam state, control the developing voltage applying unit to start supplying voltage, control the charging voltage applying unit to stop supplying voltage, and control the operation of the driving unit.   
     
     
         4 . The device according to  claim 3 , wherein:
 when being configured to control the developing voltage applying unit to start supplying voltage, the control unit is configured to control the developing voltage applying unit to start supplying voltage, and control the developing voltage applying unit to stop supplying voltage after a first predetermined period; and   when being configured to control the operation of the driving unit, the control unit is configured to control the operation of the driving unit, and stop the operation of the driving unit after a second predetermined period.   
     
     
         5 . The device according to  claim 2 , wherein:
 when being configured to control the timing of the voltage supply unit supplying the voltage to the charging voltage applying unit and the developing voltage applying unit and control the operating state of the driving unit according to the current state of the image forming device, the control unit is further configured to: when the image forming device recovers from a paper jam state to a normal state, control the developing voltage applying unit to start supplying voltage; after a third predetermined period passed since the start of the developing voltage applying unit supplying voltage, control the charging voltage applying unit to start supplying voltage; and control the driving unit to operate.   
     
     
         6 . The device according to  claim 2 , wherein:
 when being configured to control the timing of the voltage supply unit supplying the voltage to the charging voltage applying unit and the developing voltage applying unit according to the current state of the image forming device and control the operating state of the driving unit, the control unit is further configured to: when the image forming device recovers from a paper jam state to a normal state, control he driving unit to run in a direction opposite to a running direction of the image forming device before a paper jam occurs; and, after the driving unit runs for a fourth predetermined time, control the driving unit to run in a direction same as the running direction of the image forming device before the paper jam occurs; and control the charging voltage applying unit to start supplying voltage.   
     
     
         7 . The device according to  claim 4 , wherein:
 the first predetermined period and the second predetermined period are a period required for the image bearing member to rotate from a position corresponding to the charging member to a position corresponding to the developing member; or   the first predetermined period and the second predetermined period are longer than the period required for the image bearing member, the charging member and the developing member to stop rotating when a paper jam occurs in the image forming device, and are not longer than the time difference between a time when the charging voltage applying unit starts supplying voltage to the charging member and a time when the developing voltage applying unit starts supplying voltage.   
     
     
         8 . The device according to  claim 5 , wherein:
 the third predetermined period is the period required for the image bearing member to rotate from a position corresponding to the charging member to a position corresponding to the developing member, or the third predetermined period is the period corresponding to the time difference between the time when the charging voltage applying unit starts supplying voltage to the charging member and the time when the developing voltage applying unit starts supplying voltage to the developing member.   
     
     
         9 . The device according to  claim 6 , wherein:
 the fourth predetermined period is the period required for the image bearing member to rotate from a position corresponding to the developing member to a position corresponding to the charging member, or the fourth predetermined period is the period corresponding to the time difference between the time when the charging voltage applying unit starts supplying voltage to the charging member and the time when the developing voltage applying unit starts supplying voltage to the developing member.   
     
     
         10 . A control method of an image forming device, the image forming device including an image bearing member, a charging member, a developing member, and a driving unit, the method comprising:
 adjusting a control timing for applying a voltage to the charging member and the developing member according to a current state of the image forming device, and controlling an operating state of the driving unit, to eliminate charges in an area on the image bearing member between a position corresponding to the charging member and a position corresponding to the developing member,   wherein:   the image bearing member is configured to rotate;   the charging member is configured to charge the surface of the image bearing member by contacting the image bearing member;   the developing member is located in a rotation direction of the image bearing member and in downstream of the charging member along the rotation direction, and the developing member is configured to supply the developer to the image bearing member; and   the driving unit is configured to drive the image bearing member, the charging member and the developing member to rotate.   
     
     
         11 . The method according to  claim 10 , wherein:
 the image forming device further includes: a charging voltage applying unit configured to apply a charging voltage to the charging member; a developing voltage applying unit configured to apply a developing voltage to the developing member; and a voltage supply unit configured to supply voltage to the charging voltage applying unit and the developing voltage applying unit; and   the method further includes: controlling the timing of the voltage supply unit supplying voltage to the charging voltage applying unit and the developing voltage applying unit, and controlling the operating state of the driving unit, according to the current state of the image forming device.   
     
     
         12 . The method according to  claim 11 , wherein:
 controlling the timing of the voltage supply unit supplying voltage to the charging voltage applying unit and the developing voltage applying unit, and controlling the operating state of the driving unit, according to the current state of the image forming device, includes: when the image forming device is in the paper jam state, controlling the developing voltage applying unit to start supplying voltage, and controlling the developing voltage applying unit to stop supplying voltage after a first predetermined period; controlling the charging voltage applying unit to stop supplying voltage; and controlling the operation of the driving unit, and stop the operation of the driving unit after a second predetermined period.   
     
     
         13 . The method according to  claim 11 , wherein:
 controlling the timing of the voltage supply unit supplying voltage to the charging voltage applying unit and the developing voltage applying unit, and controlling the operating state of the driving unit, according to the current state of the image forming device, includes:   when the image forming device recovers from a paper jam state to a normal state, controlling the developing voltage applying unit to start supplying voltage; after a third predetermined period passed since the start of the developing voltage applying unit supplying voltage, controlling the charging voltage applying unit to start supplying voltage; and control the driving unit to operate.   
     
     
         14 . The method according to  claim 11 , wherein:
 controlling the timing of the voltage supply unit supplying voltage to the charging voltage applying unit and the developing voltage applying unit, and controlling the operating state of the driving unit, according to the current state of the image forming device, includes:   when the image forming device recovers from a paper jam state to a normal state, controlling the driving unit to run in a direction opposite to a running direction of the image forming device before a paper jam occurs; and, after the driving unit runs for a fourth predetermined time, controlling the driving unit to run in a direction same as the running direction of the image forming device before the paper jam occurs; and controlling the charging voltage applying unit to start supplying voltage.   
     
     
         15 . A non-transitory computer-readable storage medium containing a computer program that, when being executed, causes one or more processors to:
 adjust a control timing for applying a voltage to a charging member and a developing member according to a current state of an image forming device, and to control an operating state of a driving unit, to eliminate charges in an area on an image bearing member between a position corresponding to the charging member and a position corresponding to the developing member.   
     
     
         16 . The storage medium according to  claim 15 , wherein:
 the image forming device further includes: a charging voltage applying unit configured to apply a charging voltage to the charging member; a developing voltage applying unit configured to apply a developing voltage to the developing member; and a voltage supply unit configured to supply voltage to the charging voltage applying unit and the developing voltage applying unit; and   the one or more processors are further configured to: control the timing of the voltage supply unit supplying voltage to the charging voltage applying unit and the developing voltage applying unit, and control the operating state of the driving unit, according to the current state of the image forming device.   
     
     
         17 . The storage medium according to  claim 16 , wherein:
 when being configured to control the timing of the voltage supply unit supplying voltage to the charging voltage applying unit and the developing voltage applying unit, and control the operating state of the driving unit, according to the current state of the image forming device, the one or more processors are further configured to: when the image forming device is in the paper jam state, control the developing voltage applying unit to start supplying voltage, and control the developing voltage applying unit to stop supplying voltage after a first predetermined period; control the charging voltage applying unit to stop supplying voltage; and controlling the operation of the driving unit, and stop the operation of the driving unit after a second predetermined period.   
     
     
         18 . The storage medium according to  claim 16 , wherein:
 when being configured to control the timing of the voltage supply unit supplying voltage to the charging voltage applying unit and the developing voltage applying unit, and control the operating state of the driving unit, according to the current state of the image forming device, the one or more processors are further configured to:   when the image forming device recovers from a paper jam state to a normal state, control the developing voltage applying unit to start supplying voltage; after a third predetermined period passed since the start of the developing voltage applying unit supplying voltage, control the charging voltage applying unit to start supplying voltage; and control the driving unit to operate.   
     
     
         19 . The storage medium according to  claim 16 , wherein:
 when being configured to control the timing of the voltage supply unit supplying voltage to the charging voltage applying unit and the developing voltage applying unit, and control the operating state of the driving unit, according to the current state of the image forming device, the one or more processors are further configured to:   when the image forming device recovers from a paper jam state to a normal state, control the driving unit to run in a direction opposite to a running direction of the image forming device before a paper jam occurs; and, after the driving unit runs for a fourth predetermined time, control the driving unit to run in a direction same as the running direction of the image forming device before the paper jam occurs; and controlling the charging voltage applying unit to start supplying voltage.